An evaluation of the Diagnosis and Recommendation Integrated System (DRIS) on hazelnuts (Corylus avellana) in Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qj72pb57g

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  • This study evaluates Beufil's Diagnosis and Recommendation Integrated System (DRIS) on hazelnuts. Although sufficiency ranges are currently the main approach for fertilizer recommendations in Oregon, DRIS enhanced nutritional interpretations, and might alter recommendations. Reference values (DRIS norms) were developed using 15 years of published and unpublished field data. DRIS indices and Nutritional Imbalance Indices (Nil) were then calculated for a previously, published experiment. Nil was a good indicator of nutrition limitations to maximizing yield. Obtaining high yield was only possible with low Nil trees. There was a good agreement between DRIS and sufficiency ranges, especially if the relative deficiency or excess associated with corresponding relative excesses or deficiencies are evaluated. DRIS indices and Nil more clearly present both beneficial and harmful effects of altered plant mineral composition. The data indicate that using these two parameters will help in better evaluations and more valuable recommendations.
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